Subject: RE: [xsl] positional predicates in XPath vs XQL From: "Christopher R. Maden" <crism@xxxxxxxxx> Date: Fri, 23 Nov 2001 21:29:49 -0800 |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 At 21:10 23-11-2001, Howard Katz wrote: > > From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx > > [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx]On Behalf Of Christopher > > R. Maden > > > > At 15:35 23-11-2001, Howard Katz wrote: > > >To my understanding, the same location path in XPath only > > returns a single > > >node, <2>. Is my understanding correct? > > > > No. Whence did you acquire it? > >Fallacious raciotination obviously. > >I'll bite. What is the correct result in the XPath case?? Nodes 2, 5, and 7. The predicate filters its context node set, selecting the nodes for which the predicate is true. A numeric predicate n is equivalent to the full predicate position() = n. Your example was the XPath /section/para[1] and the tree 1 section 2 para 3 para 4 section 5 para 6 section 7 para 8 para 9 para [Note that this is not a well-formed XML document, though XPath can work on well-formed text entities such as this.] The XPath is equivalent to the expanded syntax /child::section/child::para[position()=1]. The first / selects the root node. The next expression selects all <section> children of the root - nodes 1, 4, and 6 in your example. The next expression, child::para, selects nodes for each node in its context. For node 1, nodes 2 and 3 are selected; for node 4, node 5 is selected; for node 6, nodes 7, 8, and 9 are selected. For each node set, the predicate is evaluated, returning true for nodes 2, 5, and 7, as they are each the first in their node set. ~Chris P.S. YM "ratiocination". HTH. HAND. - -- Christopher R. Maden, Principal Consultant, HMM Consulting Int'l, Inc. DTDs/schemas - conversion - ebooks - publishing - Web - B2B - training <URL: http://www.hmmci.com/ > <URL: http://crism.maden.org/consulting/ > PGP Fingerprint: BBA6 4085 DED0 E176 D6D4 5DFC AC52 F825 AFEC 58DA -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.8 iQA/AwUBO/8wTaxS+CWv7FjaEQJSvgCeL1eRdbrzxfoi/rAWDuzfGJoy9HAAoJOV v2cdG8esH2X3eFyNY6/05Y3g =veO5 -----END PGP SIGNATURE----- XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
RE: [xsl] positional predicates in , Howard Katz | Thread | Re: [xsl] positional predicates in , Eric van der Vlist |
RE: [xsl] positional predicates in , Howard Katz | Date | Re: [xsl] positional predicates in , Eric van der Vlist |
Month |